... 0]n-H ^°°°'' > NiFe204 (ferit spinen); OH OH I I Co(OH)2 + 2Fe(OH)3 '^°°'' > H-[0- Fe-0- Ni-0- Fe - 0]n-H '''"'' > CoFe204 ... tren, ehiing tdi chi thay ddi ndng do Ni^"" trong khoang lO'^M H- 5.10"^M va ndng do Fe^^ trong khoang 2.10"^ -^lO'^M, kit tua sau khi ly tam, nia, ... 10-^ 2. 10"^ 18,7 92,12 1,5.10"^ 3. 10-^ 18,5 94,3 2. 10"^ 4. 10"^ 18,4 96,2 2,5.10"^ 5. 10"^ 17,9 97,5 4. 10'^ 8. 10"^ 21,2...